The Aion Character PIN is a secondary password to help keep your Aion game account more secure. It is designed to thwart keyloggers and increase the security of your account.
You will still need to use your game account password to log into the game. Then, after you've set up your Aion Character PIN from your character selection screen, this PIN will also need to be entered in order to log into the game with any of your characters. You will not have to enter it again after logging out to Character Selection (without quitting the game) and when trying to log in again as the same character or another character. If you quit to desktop, you will have to re-enter the PIN.
All characters on an account, even across different servers, share the same PIN. However, if you have characters on PTS as well as the live servers, you will be able to select a different PIN for PTS.
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